AR15.Com - Troubleshooting

Uncircumsised buffer tips cause problems

6/18/2013 10:23:08 PM

While trying to diagnose some ejection problems, I disassembled by A2 buttstock to check the spring and buffer, something I never did before. I noticed buffer tip, where it meets the metal casing, had a flange of thin plastic sticking out around ...

14 5 FTEx Help

6/17/2013 11:36:36 PM

Hi Guys, I'm having some issues with FTEx on my 14.5" Carbine. Rifle Components: Upper and BCG is PSA, Barrel is a Douglas SS 1:8" Wylde Chamber, 14.5", mid length gas system, running through a Wilson LP gas block and s...

7 62x39 Build Pierced Primer

6/17/2013 10:49:49 PM

Hey Y'all, Just finished a 7.62x39 build and have got about 40 rounds of Tul steel case (all i can find at the moment) through the rifle and have had 2 pierced primers. I could not find the cartridge with the pierced primers, but base...

Feed ramps

6/17/2013 8:31:36 PM

I am fairly new to AR's and I was wondering if anybody could take pictures of what their feed ramps look like. I haven't fired any rounds out of my m400, but I have chambered a few. And it looks like some of the metal on the bullet (I mean the act...

Carbon on gastube

6/16/2013 10:12:39 PM

I have a Smith and Wesson optic ready, which after around 200 rounds through it i began to have a build up of carbon on the gas tube by the gas block. I just had a guy from Va Arms Company place a YHM low profile gas block with setscrews and a YHM...

Misaligned m4 feedramps

6/16/2013 9:17:41 PM

Finally got my new rifle out to the range, and noticed this when I got home. This is a 16" lightweight middy upper from BCM. Is this bad?

andlt andlt andlt 911andgt andgt andgt andgt andgt failure to cycle

6/16/2013 1:01:52 PM

New build upper, 20" wilson barrel, yankee hill gas block. can not get upper to cycle. Fires round but will not unlock and eject. have changed gas blocks, gas tubes, switched uppers, bolts, bolt carriers. Never had this much trouble. Any ideas wo...

Bolt carrier stuck forward

6/16/2013 12:29:43 PM

I have a Colt light carbine .223/5.56. I shot about 100rnds of steel case ammo through it this morning. It has a round in the chamber and the primer is dimpled, I pulled the charge handle back and it let it fly in an attempt to extract the ...

Gas Ring Damage

6/15/2013 9:04:25 PM

I just found a bad gas ring on the bolt of my SP-1 Clone...looks like one end broke. It was easy to remove and slide in a spare. How often do they break..I only had maybe 700-1000 rounds thru it? Also, when one is bad, should all be ch...

Newbie with a couple of build questions

6/15/2013 6:43:58 PM

Hi all, Been lurking since the beginning of the year. Finally have something to post about. I'm not sure if this post belongs here or in the build section but they are troubleshooting questions so here we go: 1. I have a ...

Small Mark on the Primer

6/15/2013 12:32:53 PM

Hi I recently started noticing a small mark on the primer when pulling the charging handle and extracting a cartridge out of my DPMS 5.56 AP4 Carbine. The round was not fired just simply un dangerfying the weapon I'm not sure of what may be causin...

Extraction Failure question

6/14/2013 11:50:31 PM

I have a Core 15 M4 MOE piston gun. When I fired the first round, it failed to extract causing the next round fed from the mag to jam up. Once cleared the rest of the mag functioned fine. It happened one more time about 4 rounds into the next maga...

Safe selector installation

6/14/2013 6:46:43 PM

Putting together an AR15 using an 80% billet lower. When the safe selector is installed it does not have crisp and snappy movement from Safe to Semi position. The selector has too much lateral play when in the safe position and is loo...

AR15 Bolt Carrier Gas Key Torque Method

6/13/2013 2:29:17 AM

I am having an issue with the gas key screws shearing. I hope someone can help me with this. I bought a Bolt Carrier Group as a kit fully disassembled. It came with all the parts, and the carrier, gas key, and gas key screws were all ...

Bolt getting stuck closed

6/12/2013 11:21:04 PM

Hey guys, new to the forum here. I have been reading it for a while, but finally registered today. First off, I have searched the forums and can not find a problem like this, maybe I have not dug down deep enough into the forums over...

Dent on ejected cases

6/12/2013 8:06:19 PM

Hey guys, I'm not totally new to ARs, as I just completed my 3rd build, but I have a problem. It's not a function problem, but rather something that caught my attention. I was just firing my new BCM 16" upper and noticed that pretty ...

FTE problems with PMC X TAC 5 56 at the range

6/12/2013 2:25:57 PM

I have a PSA M4 16" carbine that I have shot about 80 rounds of Remington UMC .223 55 gr FMJ ammo with no problems. Today at the range I decided to start using some of my PMC X-TAC 5.56 55 Gr FMJ ammo. I had rounds in three different magazines and...

AR bolt dos not lock back after last round is fired

6/10/2013 10:37:16 PM

Hey every one. Ok I just built my first AR and im hoping every one can help me trouble shoot why the bolt is not locking back after the last round but is locking back when I pull the charging handle. ok ill list all the info on the rifle so you kn...

Heavy Spring and Buffer Question

6/10/2013 10:25:49 PM

Having read this article- http://www.defensereview.com/the-big-m4-myth-fouling-caused-by-the-direct-impingement-gas-system-makes-the-m4-unreliable/ - and many other sources regarding carbine length gas syst...

Front sight will not adjust Spikes upper

6/10/2013 4:19:11 PM

I got my new spikes 14.5 middy in the mail 2 weeks ago and just got out today to shoot it. The rifle ran like a champ and was super accurate got my EOtech nice and zeroed then moved on to my irons and that is where I had a problem. I got the winda...

My 14 5 carbine not picking up next cartridge upon cycling

6/10/2013 3:47:00 PM

I recently built an AR-15, 14.5" carbine, and it's failing to strip rounds from the magazine almost every time. When I rack it, it will strip and feed a round correctly. If it's the only round in the magazine, the bolt will be held back correct...

Aero Precision lower Magwell tight or Pmags swell

6/10/2013 11:08:41 AM

I'm putting together my first AR. I just assembled the lower and inserted a loaded Pmag. I was a little snug, and would not drop free. Lubed it, worked it, no improvement, I keep three Pmags loaded at all times for my MSAR (magwell is much looser ...

Positive extraction

6/10/2013 9:34:46 AM

My LMT 16" carbine with LMT SA BCG and Car buffer is extracting so that the casings hit the deflector of the upper. Im trying to get the extraction be more positive but got no difference in result when switching to a FA BCG and H2 buffer. <...

marks on bullet II

6/8/2013 8:25:44 PM

Hi! I read alloutmx's post below and I've got the same thing and it looks like the verdict is that is normal. How does this effect accuracy? I just completed a 18" rifle gas length 3 gun build and have not fired it yet. Headspaces checks out a...

Mark on bullet primer

6/8/2013 7:35:50 PM

My build is almost complete (less optics) and I got anxious so I loaded 4 rounds in the mag and pulled the changing handle and cycled them through to see if the bolt would lock up and they would feed well. All seemed fine. They fed well and the ri...

Buffer retent failure failure to fire problem

6/8/2013 3:16:42 PM

Today my cheapo AR was running just dandy until I got the dreaded "click" of a no-fire. I ejected the round and found it to be fine, then tried again. This time it fired, ejected, and loaded a fresh round, but again, when I pulled the trigger the ...

AR 10 3 SBR with gas valve how light can buffer go

6/8/2013 12:49:07 PM

Ok, now for something a bit different. I have an SBR 10.3" with an MGI gas tube with valve that I use to decrease the pressure in hopes of modulating recoil. The system sports a JP reduced mass bolt and I have removed a few weights on...

Ejection port cover detent

6/7/2013 9:20:36 PM

The detent assembly on my ejection port cover is loose. If I press the detent in, if falls right out of the cover. On other rifles I have it appears to be pressed in to place. Is there a way for me to secure the detent assembly or do...

10 5 upper not cycling

6/7/2013 3:50:08 PM

I put together a 10.5" upper awhile back and had my first issue today. The rifle is all spike's except for the PSA FN barrel. BCG is NiB and I'm running a spike's T2 buffer with a standard buffer spring. I did all the work myself ex...

AR15 Won t Cycle Eject after 1st round

6/6/2013 7:47:19 PM

I just replaced my upper receiver for a DPMS A3 model. I got a new gas block and a new gas tube as well along with a Magpul MOE handguard. After putting everything together and going to test first my rifle, it wouldn't fire more than ...